<!--SIF Implementation Specification 2.2-6 (March 17, 2008)-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" targetNamespace="http://www.sifinfo.org/infrastructure/2.x" xmlns:sif="http://www.sifinfo.org/infrastructure/2.x" elementFormDefault="qualified">
  <xs:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="imports/xml/xml.xsd" />
  <xs:complexType name="LearningStandardItemType">
    <xs:sequence>
      <xs:element name="StandardSettingBody" minOccurs="0" nillable="true">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="Country" type="sif:CountryType" />
            <xs:element name="StateProvince" minOccurs="0" nillable="true" type="sif:StateProvinceType" />
            <xs:element name="NCESId" minOccurs="0" nillable="true" type="sif:NCESIdType" />
            <xs:element name="SettingBodyName" minOccurs="0" nillable="true" type="xs:normalizedString" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="StandardHierarchyLevel">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="Number" type="xs:unsignedInt" />
            <xs:element name="Description" type="xs:string" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="PredecessorItems" minOccurs="0" nillable="true">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="LearningStandardItemRefId" minOccurs="0" maxOccurs="unbounded" type="sif:IdRefType" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="StatementCodes" minOccurs="0" nillable="true">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="StatementCode" minOccurs="0" maxOccurs="unbounded" type="xs:token" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="Statements" minOccurs="0" nillable="true">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="Statement" maxOccurs="unbounded" type="xs:string" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="GradeLevels" type="sif:GradeLevelsType" />
      <xs:element name="SubjectArea" minOccurs="0" nillable="true" type="sif:SubjectAreaType" />
      <xs:element name="StandardIdentifier" minOccurs="0" nillable="true">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="YearCreated" type="xs:gYear" />
            <xs:element name="SubjectArea" type="sif:SubjectAreaType" />
            <xs:element name="StandardNumber" type="xs:normalizedString" />
            <xs:element name="GradeLevels" type="sif:GradeLevelsType" />
            <xs:element name="Benchmark" minOccurs="0" nillable="true" type="xs:normalizedString" />
            <xs:element name="GradeLevel" minOccurs="0" nillable="true" type="sif:GradeLevelType" />
            <xs:element name="IndicatorNumber" minOccurs="0" nillable="true" type="xs:normalizedString" />
            <xs:element name="AlternateIdentificationCodes" minOccurs="0" nillable="true">
              <xs:complexType>
                <xs:sequence>
                  <xs:element name="AlternateIdentificationCode" maxOccurs="unbounded" type="xs:normalizedString" />
                </xs:sequence>
              </xs:complexType>
            </xs:element>
            <xs:element name="Organization" type="xs:normalizedString" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="LearningStandardDocumentRefId" type="sif:IdRefType" />
      <xs:element name="RelatedLearningStandardItems" minOccurs="0" nillable="true">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="LearningStandardItemRefId" minOccurs="0" maxOccurs="unbounded">
              <xs:complexType>
                <xs:simpleContent>
                  <xs:extension base="sif:IdRefType">
                    <xs:attribute name="RelationshipType" use="required">
                      <xs:simpleType>
                        <xs:union>
                          <xs:simpleType>
                            <xs:restriction base="sif:LearningStandardItemRelationshipTypesType" />
                          </xs:simpleType>
                          <xs:simpleType>
                            <xs:restriction base="xs:token" />
                          </xs:simpleType>
                        </xs:union>
                      </xs:simpleType>
                    </xs:attribute>
                  </xs:extension>
                </xs:simpleContent>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="SIF_Metadata" minOccurs="0" nillable="true" type="sif:SIF_MetadataType" />
      <xs:element name="SIF_ExtendedElements" minOccurs="0" nillable="true" type="sif:SIF_ExtendedElementsType" />
    </xs:sequence>
    <xs:attribute name="RefId" use="required" type="sif:RefIdType" />
    <xs:attribute ref="xml:lang" use="required" />
  </xs:complexType>

  <xs:element name="LearningStandardItem" type="sif:LearningStandardItemType" />

</xs:schema>